FBToolkit.Samples.Connect.Web settings

I'm trying to replicate the "FBToolkit.Samples.Connect.Web" sample application without success.

I've only altered the code tu use my FacebookApp and always get:

Invalid Argument

The Facebook Connect cross-domain receiver URL (http://localhost/xd_receiver.htm#fname=_opener&%7B%22t%22%3A3%2C%22h%22%3A%22fbCancelLogin%22%2C%22sid%22%3A%220.711%22%7D) must have the application's Connect URL (http://127.0.0.1:80/)
as a prefix. You can configure the Connect URL in the
Application Settings Editor.

I can't understand how to configure the "Connect URL", "Base Domain", etc.